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rla 10-17-2012 14:01:07 162.39.22.109 Report to Moderator	Does anyone know or has anyone checked the difference in head temps using either types of gasoline?? I am just wondering, since on older air cooled engine's the head temps are much higher using U85.. Also since I now have 2 tractors a 620 & 630 with cracked heads? Would this be true in water cooled engines as well? Both have working thermostats & neither have been overheated. But Both get worked. & Both have A5621R heads. Since spark plugs are at least 2 heat ranges hotter, just don't know whether I'm am thinking right or wrong.. Maybe I'm just Lucky? LOL [Reply]   [No Email]
buickanddeere 10-20-2012 07:39:39 209.240.115.208 Report to Moderator	Re: Head Temps with U85 Gas.. in reply to rla, 10-17-2012 14:01:07   Thermal shock cracks the heads. Thermal shock is caused by careless operators.   [Reply]  [No Email]
Hittin' Hard 10-20-2012 05:53:50 184.61.14.182 Report to Moderator	Re: Head Temps with U85 Gas.. in reply to rla, 10-17-2012 14:01:07   I'm running it in a b puller and I've got both jets opened up just about double from what I was running them at with pump gas.   [Reply]  [No Email]
jd b puller 10-17-2012 18:31:13 65.190.135.248 Report to Moderator	Re: Head Temps with U85 Gas.. in reply to rla, 10-17-2012 14:01:07   You need to use about 50% more E-85 than regular fuel. These old tractors were pretty forgiving on fuel, but as stated before, you're way lean. You need to change or drill out the jets in the carb. I haven't messed with E-85 in a duplex, but in a single, I basically had the load jet all the way open and it was a tick lean. (A little lean is good, you are a lot lean). Also, colder plugs would be a better direction than "hotter" plugs. E-85 is a little unusual in that it stutters when it's lean and also when it's rich. I never got mine rich enough to make it black smoke, but if real lean, it would white smoke (not sure if it was so hot it was burning up the oil residue in the cylinder or trying to cook the pistons. When I pulled the head, the pistons looked good though. E-85 is great if you're looking for HP. If you're looking to save money over 87 octane, you are barking up the wrong tree.   [Reply]  [No Email]
gtx1967jewison 10-17-2012 17:19:40 174.253.146.232 Report to Moderator	Re: Head Temps with U85 Gas.. in reply to rla, 10-17-2012 14:01:07   E85 at the proper tune will give a LOWER head temp. Alcohol Burns cooler. The reason your seeing high head temps is a LEAN mixture. You must richen the mixture ALOT to use E85. Like 20%+   [Reply]  [No Email]
BushogPapa 10-17-2012 16:16:44 173.88.51.117 Report to Moderator	Re: Head Temps with U85 Gas.. in reply to rla, 10-17-2012 14:01:07   Do you mean "E-85" ??? Head temps should be lower with it as it takes more per given amount of air.. The 620, etc seldom crack a head if cool water is NEVER added to a warm engine... Ron..   [Reply]  [No Email]
donmyeil 10-17-2012 14:39:13 74.32.241.119 Report to Moderator	Re: Head Temps with U85 Gas.. in reply to rla, 10-17-2012 14:01:07   Cracked heads wasnt unusual on those tractors .   [Reply]  [No Email]